docs: def is_valid_mimetype(response):
      """ Return ``True`` if the mimetype is not blacklisted.
  
      :rtype: bool
  
      """
      blacklist = [
          'image/',
      ]
  
      mimetype = response.get('mimeType')
      if not mimetype:
          return True
  
      for bw in blacklist:
          if bw in mimetype:
              return False
  
      return True